my translator was set at 6% rich and did the same thing, turn it down and see if that clears it up. (i think it was you that said thats where you had yours set)
no see its been like that as long as i can remember with the extender chip.
ive had various tunes from 0% to 6% rich and its always had a little surge. its just more noticeable now that my turbo spools up faster (with the Manual boost controler)